The poll watchers were ‘not from around here’.
Somehow I can’t see them ratting themselves out.
Elsewhere, someone else suggested some invested rich donor (hello, Donald Trump?) establish a bounty fund for those providing evidence that leads to a conviction on voter fraud. I’d add, it ought to be enough for that person to be able to pick up and move out of his/her neighborhood.
Then the rat-outs will come thick and heavy.